U.S. President Barack Obama and first lady Michelle Obama wave as they depart Waterkloof Air Base for a flight to Cape Town on Sunday, June 30, 2013, in Centurion, South Africa. The president is in South Africa, embarking on the second leg of his three-country African journey. The visit comes at a poignant time, with former South African president and anti-apartheid hero Nelson Mandela ailing in a Johannesburg hospital. (AP Photo/Evan Vucci)

Associated Press
U.S. President Barack Obama and first lady Michelle Obama wave as they depart Waterkloof Air Base for a flight to Cape Town on Sunday, June 30, 2013, in Centurion, South Africa. The president is in South Africa, embarking on the second leg of his three-country African journey. The visit comes at a poignant time, with former South African president and anti-apartheid hero Nelson Mandela ailing in a Johannesburg hospital. (AP Photo/Evan Vucci)
U.S. President Barack Obama and first lady Michelle Obama wave as they depart Waterkloof Air Base for a flight to Cape Town on Sunday, June 30, 2013, in Centurion, South Africa. The president is in South Africa, embarking on the second leg of his three-country African journey. The visit comes at a poignant time, with former South African president and anti-apartheid hero Nelson Mandela ailing in a Johannesburg hospital. (AP Photo/Evan Vucci)
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